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Exam 3_SP03 - CHEM 111 Spring 2003 Constants R = 0.082057...

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CHEM 111 Spring 2003 Exam 3      Name ________________________ Constants: R = 0.082057 K mole atm L = 62.363 K mole L mmHg = 8.31451 mole K J 1 J = 1 Kg 2 2 s m h = 6.6256 x 10 - 34 J s c = 2.998 x 10 8 m/s Equations: 2 1 rate rate = 1 2 M M PV = nRT KE = 2 1 mv 2 v rms = M RT 3 H reaction = Σ ( o f H of products) - Σ ( o f H of reactants) ν = c/ λ E = h ν Multiple choice. 5 pts. each. Partial credit may be given if some work or thought process is shown. 1. A sample of argon occupies a volume of 4.75 L at 0.89 atm pressure and 37 o C. If the pressure is held constant but the temperature is dropped to - 8 o C, what will the new volume of the argon be? a) 4.06 L b) 0.246 L c) 0.974 L d) 1.03 e) 5.56 L 2. Which of the following equations represents a reaction for direct determination of a o f H ? All of the equations are balanced and are otherwise chemically correct. a) 2 N 2 (g) + 4 H 2 (g) + 3 O 2 (g) 2 NH 4 NO 3 (s) b) C (diamond) + O 2 (g) CO 2 (g) c) C (graphite) + 3/2 O 2 (g) + 2 Na (s) Na 2 CO 3 (s) d) H 2 O (liq) + CO 2 (g) H 2 CO 3 (aq) e) NO (g) + CO 2 (g) NO 2 (g) + CO (g) 3. Calculate the amount of heat energy required to heat a 6.00 g manganese bar from –35 o C to +120 o C. C sp for manganese in this temperature range is 0.479 J/g-K 4. What is E overall for a process having the following 3 steps? Step 1: The system absorbs 15 J of heat while 12 J of work are performed on it. Step 2: The system releases 17 J of heat while doing 9 J of work. Step 3: The system releases 6 J of heat while 27 J of work are performed on it. a) - 32 J b) +22 J c) +40 J d) +86 J
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